STANDARD PROCEDURE - PISTON RING FITTING



Before reinstalling used rings or installing new rings, the ring clearances must be checked.



NOTE: The ring gap measurement must be made with the ring positioned at least 12mm (0.50 inch.) from bottom of cylinder bore.





PISTON RING SIDE CLEARANCE

NOTE: Make sure the piston ring grooves are clean and free of nicks and burrs.




PISTON RING SPECIFICATION CHART

Ring Position
  		Groove Clearance
  		Maximum Clearance
  
Upper Ring
  		.051-.094 mm
  		0.11 mm
  
 (0.0020-.0037 in.)
  		(0.004 in.)
  
Intermediate Ring
  		0.04-0.08 mm
  		0.10 mm
  
 (0.0016-0.0031 in.)
  		(0.004 in.)
  
Oil Control Ring
  		.019-.229 mm
  		.25 mm
  
(Steel Rails)
  		(.0007-.0090 in.)
  		(0.010 in.)
  
Ring Position
  		Ring Gap
  		Wear Limit
  
Upper Ring
  		0.20-0.36 mm
  		0.43 mm
  
 (0.0079-0.0142 in.)
  		(0.0017 in.)
  
Intermediate Ring
  		0.37-0.63 mm
  		0.74 mm
  
 (0.0146-0.0249 in.)
  		(0.029 in.)
  
Oil Control Ring
  		0.025-0.76 mm
  		1.55 mm
  
(Steel Rail)
  		(0.0099- 0.03 in.)
  		(0.061 in.)
  




NOTE: Piston rings are installed in the following order:

  • Oil ring expander.
  • Upper oil ring side rail.
  • Lower oil ring side rail.
  • No. 2 Intermediate piston ring.
  • No. 1 Upper piston ring.